Method for producing seamless articles of caoutchouc



Nov. 21 1923.

A. BOECLER METHOD FOR PRODUCING SEAMLESS ARTICLES OF CAOUTCHOUC Filed Sept. 25 1919 I 1/ I 17 7/ [M 11/41 I Patented Nov. 27, 1923.

UNITED STATES 1,475,738 PATENT oFFicE.

ALBERT 30m 0]? MALMO, SWEDEN, ASSIGNOR T0 BENZINE CONDENSATION CO. INC, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

METHOD FOR PRODUCING SEAMLESS ARTICLES OF CAOUTCHOUC.

Application filed September 25, 1919. Serial No. 326,300.

To all whom it may com-em:

Be it known that I, ALBERT BOECLER, subject of Germany, residing at Malmo, in

the Kingdom of Sweden, have invented certain new and useful Improvements in Meth-- ods for Producing Seamless Articles of Gaoutchouc, of which the following is a specificatio The present invention refers to -.a method for producing seamless articles of caoutchouc by the aid of patterns of moulding bodies, which are dipped into a liquid caoutchouo, applying at the same time heat to the pattern and rotating it to enable the equally distributed liquid solution of caoutchouc to dry on the pattern.

According to the present invention the drying of the film on the pattern takes place from inside to outside, referably by heating the pattern or moul ing body itself. In carrying out this method the degree of saturatlon of the surrounding air is considerably increased, the requisite movement of the air saturated with vapors taking place from the heating appliance to a cooling device for condensing the vapors of the solvent, even when fully enclosed.

In the drawing Fig. 1 is a vertical section of the apparatus and Fig. 2 a cross section of the pattern carrier drawn to the line A-A of Fig. 1.

Within a casing 11 a hollow shaft 6 is 10111- naled, on which the pattern carrier 0 is attached. Steam or hot water or hot air is allowed to enter the hollow shaft 6, which is connected with a hollow pattern carrier 0 b pipes d. A series of patterns 7 are attac ed to the carrier 0 in such manner that the heat medium can enter the hollow patterns from the carrier 0. Below a trap or door It on the bottom of the casing a a carriage g is arranged, which in a known manner is constructed to hold a certain amount of rubber solution. After opening the trap It the carriage 9 can be lifted up in any known manner, so as to allow the patterns f to dip into the liquid caoutchouc. It will be seen that a thin film of caoutchouc is applied to the patterns 7, when the carriage again is lowered to its original position. The lower part of the wall of the casing is constructed hollow to form a cooling mantle. The vapors condensing on the part i of the mantle will condense into a liquid, which is collected in a trough k on the bottom of the casing, from which trough the condensed liquid can be led away in any convenient manner. The cooling liquid will enter the hollow wall 2' by the pipe m and be led ofi' by the pipes n.

In making use of this invention no blisters or flaws will arise on the rubber articles,

even. if considerably high temperature is used. Heretofore blisters were created in the known machines, where heat is employed, by the fact, that the film of caoutchouc, on the patterns or mandrels was dried from outside to inside. If the temperature in such case is considerably hi h, then the outer surface of the film will ry momentarily and this surface will be impermeable for the vapors created in the inner parts of the film, which are still damp. The consequence is that in trying to escape, these vapors will create blisters or flaws and to avoid these drawbacks, it was heretofore necessary to carry out an evaporation by very slowly heating at a low temperature, for instance below 25 Celsius.

In carrying out the new method, these drawbacks will not take place. Each film will be dried from inside to outside and even if a second film is applied to a rubber article, which by the previous operation was not fully dried, there is no fear of any creation of blisters, since the drying process will still take place from inside to outside. Therefore the drying temperature can be considerably increased and consequently the difference between the degree of saturation of the air for benzine at the heating temperature and that at the cooling temperature can be increased to a similar extent. The air,- which may be even oversaturated. moves in a continuous stream from the heating device to the cooling device, hereby giving off the benzine vapors to the latter. The isolation of heat, which is enlarged by the increasing number of films on the mandrels can be balanced by a corresponding regulation of temperature or by the length of the time employed for dipping.

I claim:

1. Method of making seamless rubber articles, comprising dipping an interiorly heated mold into a body of rubber solution, both mold and body of solution being contained in a closed chamber and cooling said chamber to condense the vapors on the sides thereof.

2. M 121001 01? 1112i" ng seamkss rubbs'famides, wmpfiin an interiorly heated mold into a body 01? rubber solufiian the mold being arranged sfasve the bcdy of salutien within clnsed chamber and 00-01 iha lower p0 i011 of the chamber C0 0011- dense mpm's of rubbe alvanic.

3. Method 01 5 nmking sem'nless "rubber articles, which comprises dipping an infiw ciziamber While 11h smu; chamber.

EGECLER. 

